JP2005337635A - Cooling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device with low power consumption capable of rapidly freezing an object to be frozen.
In this cooling device, the cooling capacity of the Stirling refrigerator 11 is increased in response to the precooling switch 42 being turned on, and the cooling fan 24 is turned off so that the temperature Tc of the low temperature side evaporator 15 is made higher than usual. The cooling fan 24 and the quick cooling fan 23 are turned on when the quick freezer compartment door 6 is closed and then closed. Therefore, the object to be frozen can be rapidly frozen.
[Selection] Figure 3

Description

  The present invention relates to a cooling device including a freezing chamber cooled by a cooling fan, and more preferably, a cooling device including a freezing chamber cooled by cold heat conveyed from a cooling unit of a Stirling refrigerator via a secondary refrigerant. About.

In recent years, the adverse effects of CFCs on the global environment have been pointed out, and those equipped with Stirling refrigerators as cooling devices that do not use CFCs are drawing attention. In this cooling device, the cold heat of the cold head of the Stirling refrigerator is transmitted to the low temperature side evaporator, and the cold air of the low temperature side evaporator is supplied to the freezer compartment by a cooling fan (for example, see Patent Document 1).
JP 2002-221384 A

  By the way, in order to suppress the quality deterioration of the frozen object due to freezing / thawing, it is necessary to reduce the ice generated in the cells of the frozen object during freezing and to suppress the destruction of the cells by the ice. The size of the ice increases in proportion to the time during which the object to be frozen passes through the maximum ice crystal generation temperature zone. Therefore, it is necessary to rapidly freeze the object to be frozen by lowering the temperature of the freezer. On the other hand, if the temperature of the freezer compartment is constantly lowered, the power consumption of the cooling device increases.

  Therefore, a main object of the present invention is to provide a cooling device with low power consumption that can rapidly freeze an object to be frozen.

  The cooling device according to the present invention is a cooling device provided with a freezer compartment, an evaporator cooled by the refrigerator, a cooling fan for supplying the cooler of the evaporator into the freezer compartment, and input of signals relating to quick freezing And a control unit that executes a pre-cooling mode operation in which the cooling fan is stopped to drive the refrigerator. The present invention may be applied to a commercially available refrigerator-freezer, but may be applied to a cooling device having a secondary refrigerant circulation circuit that conveys cold heat from a cooling unit of a Stirling refrigerator to a low-temperature evaporator. More preferred.

  In the cooling device according to the present invention, the pre-cooling mode operation is performed in which the cooling fan is stopped and the refrigerator is driven based on the input of a signal related to quick freezing. Therefore, it is possible to store in the evaporator before the frozen object enters the maximum ice crystal generation temperature zone, and to shorten the time for the frozen object to pass through the maximum ice crystal generation temperature zone. In addition, when there is no input of a signal related to quick freezing, since the operation is performed as usual, an increase in power consumption can be suppressed.

[Embodiment 1]
1 is a schematic cross-sectional view showing a configuration of a cooling device according to Embodiment 1 of the present invention, and FIG. 2 is a piping configuration diagram of the cooling device. 1 and 2, the cooling device is for food preservation and includes a housing 1 having a heat insulating structure. The interior of the housing 1 is partitioned into three upper and lower stages, and a refrigerator compartment 2, a quick freezer compartment 3 and a freezer compartment 4 are formed from the upper side. Heat-insulating refrigerator compartment door 5, quick freeze compartment door 6 and freezer compartment door 7 can be freely opened and closed at the front side (left side in FIG. 1) openings of refrigerator compartment 2, quick freeze compartment 3 and freezer compartment 4, respectively. Is provided. On the back surface of each of the doors 5 to 7, a door packing 8 having a shape surrounding the opening of the corresponding chamber is mounted. A shelf 9 suitable for the type of food to be stored is appropriately arranged inside the housing 1.

  A machine room 10 is provided at one corner of the upper and rear surfaces of the housing 1, and a Stirling refrigerator 11 is installed in the machine room 10. A cooling system having a Stirling refrigerator 11 as a central element is disposed from the upper surface to the rear surface and further to the lower surface of the housing 1.

The Stirling refrigerator 11 has a cold head (not shown) for taking out the cold generated by driving, and a low-temperature side condenser 12 is attached so as to cover the cold head. In addition, a low temperature side evaporator 15 is installed in the back of the freezer compartment 4. The low temperature side condenser 12 and the low temperature side evaporator 15 are connected via a low temperature side secondary refrigerant circulation pipe 14, and a secondary refrigerant circulation circuit is configured by both. The secondary refrigerant circuit is filled with a natural refrigerant such as CO ₂ , and cold heat is transferred between the low temperature side evaporator 15 and the low temperature side condenser 12.

  Inside the housing 1, a duct 20 is provided for distributing the cold air obtained by the low temperature side evaporator 15 to the refrigerator compartment 2, the quick freezer compartment 3 and the freezer compartment 4. In the duct 20, a cold air outlet 21 communicating with the refrigerator compartment 2, the quick freezer compartment 3 or the freezer compartment 4 is provided at an appropriate place. In the duct 20, there are provided a refrigeration fan 22, a quick refrigeration fan 23, and a cooling fan 24 for forcibly sending cold air to the refrigeration room 2, the quick freezing room 3, and the freezing room 4. The cooling fan 24 and the low temperature side evaporator 15 are provided in the low temperature side evaporator chamber 16.

  The Stirling refrigerator 11 has a worm head (not shown) for taking out the heat generated by driving, and a high temperature side evaporator 13 is attached so as to cover the worm head. In addition, a high temperature side condenser 31 and a blower fan 32 that dissipate heat to the outside environment are provided on the upper surface of the housing 1. The high temperature side evaporator 13 and the high temperature side condenser 31 are connected via a high temperature side secondary refrigerant circulation pipe 30, and a high temperature side natural circulation circuit is configured by both. Water (including an aqueous solution) or a hydrocarbon-based natural refrigerant is sealed in the high temperature side natural circulation circuit, and the refrigerant naturally circulates in the high temperature side natural circulation circuit.

  Next, the operation of this cooling device will be described. When the Stirling refrigerator 11 is driven, the temperature of the cold head decreases. Therefore, the low temperature side condenser 12 is cooled and the refrigerant | coolant inside is condensed.

  The secondary refrigerant condensed in the low temperature side condenser 12 flows into the low temperature side evaporator 15 through the low temperature side secondary refrigerant circulation pipe 14. The secondary refrigerant that has flowed into the low temperature side evaporator 15 is evaporated by the heat of the airflow passing outside the low temperature side evaporator 15, and the surface temperature of the low temperature side evaporator 15 is lowered. Therefore, the air passing through the low-temperature side evaporator 15 becomes cold air and is blown out from the cold air outlet 21 of the duct 20 to the freezer compartment 4 and the like, and the temperature of the freezer compartment 4 and the like is lowered. The secondary refrigerant evaporated in the low-temperature side evaporator 15 returns to the low-temperature side condenser 12 through the low-temperature side secondary refrigerant circulation pipe 14, where heat is taken away and condensed again.

  On the other hand, the warm heat generated by driving the Stirling refrigerator 11 is radiated to the high temperature side evaporator 13 via the warm head. The inside of the high temperature side evaporator 13 is deprived of heat by the heat of vaporization caused by the evaporation of the secondary refrigerant.

  The secondary refrigerant in a vapor phase evaporated by the high temperature side evaporator 13 passes through the high temperature side secondary refrigerant circulation pipe 30 and flows into the high temperature side condenser 31 provided above. The secondary refrigerant that has flowed into the high-temperature side condenser 31 is condensed by being deprived of heat by the air flow introduced into the high-temperature side condenser 31 from the outside by the blower fan 32. The secondary refrigerant condensed in the high temperature side condenser 31 returns to the high temperature side evaporator 13 through the high temperature side secondary refrigerant circulation pipe 30, where it receives heat and evaporates again.

  Next, a quick freezing method that is a feature of this cooling device will be described. In FIG. 3, the cooling device further includes temperature detectors 40 and 41, a precooling switch 42, a door open / closed state detector 43, and a control unit 44. The temperature detector 40 detects the temperature Tc of the low temperature side evaporator 15 and gives a signal indicating the detected temperature Tc to the control unit 44. The temperature detector 41 detects the temperature Tq in the quick freezer 3 and gives a signal indicating the detected temperature Tq to the control unit 44.

  For example, the precooling switch 42 is provided on the outer surface of the quick freezer compartment door 6 and, when turned on by the user of the cooling device, gives a signal to the control unit 44 to instruct the start of the precooling mode. The door open / close state detector 43 detects the door open / close state, that is, whether the quick freezer compartment door 6 is opened or closed, and provides a signal indicating the detection result to the control unit 44. The control unit 44 controls the Stirling refrigerator 11, the cooling fan 24 and the quick freezing fan 23 in accordance with signals from the temperature detectors 40 and 41, the precooling switch 42 and the door open / closed state detector 43.

  4 to 8 are flowcharts showing the control operation of the control unit 44. In step S1, the control unit 44 waits for the precooling switch 42 to be turned on. When the precooling switch 42 is turned on, a precooling mode is started in step S2. When the pre-cooling mode is started, in step S3, the control unit 44 sets the cooling capacity of the Stirling refrigerator 11 to a level higher than normal, turns off the cooling fan 24, and starts a pre-cooling timer.

  In step S4, temperature control in the precooling mode is performed. FIG. 6 is a flowchart showing temperature control in the precooling mode. In step S21, the control unit 44 determines whether or not the temperature Tc of the low temperature side evaporator 15 detected by the temperature detector 40 is equal to the set value. If Tc is equal to the set value, the process proceeds to step S22. If Tc is not equal to the set value, the process proceeds to step S23. As the set value of Tc is set to a lower temperature, the cold storage effect of the secondary refrigerant increases, and the time for the object to be frozen to pass through the maximum ice crystal generation temperature zone can be shortened. However, if the set value of Tc is set too low, the secondary refrigerant may freeze. Therefore, the set value of Tc needs to be set to a temperature at which the secondary refrigerant does not freeze.

  In step S22, the cooling capacity of the Stirling refrigerator 11 is maintained, the state of the cooling fan 24 (off state) is maintained, and the process proceeds to step S5. In step S23, it is determined whether or not Tc is higher than the set value. If Tc is higher than the set value, the process proceeds to step S24, and if Tc is not higher than the set value, the process proceeds to step S25. In step S24, the cooling capacity of the Stirling refrigerator 11 is increased, the cooling fan 24 is turned off, and the process proceeds to step S5. In step S25, the cooling capacity of the Stirling refrigerator 11 is maintained or lowered, and the process proceeds to step S5. In this way, in the precooling mode, the temperature Tc of the low temperature side evaporator 15 is controlled so as not to become lower than the set value.

  Returning to FIG. 4, in step S5, the control unit 44 determines whether or not the pre-cooling timer has timed the predetermined time 1, and if the pre-cooling timer has not timed the predetermined time 1, the process proceeds to step S7. Advances to step S6.

  In step S6, although the quick freezing switch 42 is turned on, the quick freezing compartment door 6 has not been opened or closed, that is, no freezing object has been stored in the quick freezing compartment 3, so the quick freezing release mode is executed. . FIG. 7 is a flowchart showing the quick freeze release mode. In FIG. 7, in the quick freezing release mode, the driving state of the Stirling refrigerator 11 is lowered in step S30, the cooling fan 24 is set in the control state, the pre-cooling timer is reset, and the temperature control returns to the normal mode.

  Returning to FIG. 4, in step S <b> 7, the control unit 44 determines whether or not the pre-cooling timer has timed the predetermined time 2 (<predetermined time 1). In step S8, a buzzer, a lamp or the like notifies that the pre-cooling has been completed. If the pre-cooling timer has not counted the predetermined time 2, the process proceeds to step S9. In step S9, the control unit 44 determines whether or not the quick freezer compartment door 6 is opened based on the output signal of the door open / close state detector 43. If the quick freezer compartment door 6 is not opened, step S4 is performed. If the quick freezer compartment door 6 is opened, the process proceeds to step S10 in FIG.

  In step S10, the pre-cooling timer is turned off and the door opening timer is started. In step S11, it is determined whether or not the door open timer value is smaller than the set value. If the door open timer value is not smaller than the set value, the cooling device user is informed that the door is open in step S12. For example, when a buzzer sound is notified and the door opening timer value is smaller than the set value, the process proceeds to step S13.

  In step S <b> 13, the control unit 44 waits for the object to be frozen to be stored in the quick freezer 3 and the quick freezer door 6 to be closed. When the quick freezing door 6 is closed, a door closing timer is started in step S14. In step S15, the cooling fan 24 and the quick freezing fan 23 are turned on, and in step S16, temperature control in the quick freezing mode is executed.

  FIG. 8 is a flowchart showing temperature control in the quick freezing mode. In step S31, the control unit 44 determines whether or not the temperature Tq of the quick freezer compartment 3 is equal to the set value. If Tq is equal to the set value, the process proceeds to step S32, and if Tq is not equal to the set value. Proceed to step S33. In step S32, the cooling capacity of the Stirling refrigerator 11 is maintained, the cooling fan 24 and the quick freezing fan 23 are turned on, and the process proceeds to step S17. In step S33, it is determined whether or not Tq is higher than the set value. If Tq is higher than the set value, the process proceeds to step S34, and if Tq is not higher than the set value, the process proceeds to step S35. In step S34, the cooling capacity of the Stirling refrigerator 11 is increased, the cooling fan 24 and the quick freezing fan 23 are turned on, and the process proceeds to step S17. In step S35, the cooling capacity of the Stirling refrigerator 11 is maintained or lowered, the cooling fan 24 is turned off, the quick freezing fan 23 is turned off, and the process proceeds to step S17. Thus, in the quick freezing mode, the temperature Tq of the quick freezing chamber 3 is controlled to be equal to the set value.

  Returning to FIG. 5, in step S <b> 17, the control unit 44 determines whether or not a predetermined quick-freezing time has elapsed since the quick-freezer compartment door 6 was closed. Returning to S16, when the predetermined time for quick freezing has elapsed, the process returns to the normal temperature control mode.

  In the first embodiment, the cooling capacity of the Stirling refrigerator 11 is increased in response to the precooling switch 42 being turned on, and the cooling fan 24 is turned off to increase the temperature of the secondary refrigerant circulation circuit (particularly the secondary refrigerant). The cooling fan 24 and the quick freezing fan 23 are turned on in response to being closed after the quick freezing room door 6 is opened. Therefore, the frozen object can be rapidly passed through the maximum ice crystal generation temperature zone by the cooling power stored in the secondary refrigerant circulation circuit, and the quality of the frozen object can be prevented from being deteriorated due to freezing and thawing. Further, since the cooling capacity of the Stirling refrigerator 11 is increased only when the pre-cooling switch 42 is turned on, the increase in power consumption can be reduced.

  In the first embodiment, the Stirling refrigerator 11 and the cooling fan 24 are controlled so that the temperature Tc of the low-temperature side evaporator 15 becomes a set value in the pre-cooling mode, but the secondary refrigerant circulation circuit is controlled by the temperature detector 40. It is also possible to detect the temperature of an arbitrary portion of and to control based on the detected temperature. For example, the temperature of the cold head of the Stirling refrigerator 11 may be controlled to be a set value.

  In the first embodiment, the pre-cooling mode is started in response to the pre-cooling switch 42 being turned on. However, the pre-cooling mode 42 is removed and the pre-cooling mode is opened in response to the quick freezer compartment door 6 being opened. You may start. Furthermore, even if the quick freezer compartment door 6 is opened and closed, the quick freeze mode may be stopped by detecting that the object to be frozen has not been accommodated in the quick freezer compartment 3 with an infrared sensor.

[Embodiment 2]
FIG. 9 is a block diagram showing a configuration of a portion related to the quick refrigeration mode of the cooling device according to the second embodiment of the present invention, and is compared with FIG. Referring to FIG. 9, this cooling device is different from the cooling device of FIG. 3 in that the precooling switch 42 and the door open / closed state detector 43 are removed, and a quick freezing switch 45 and a temperature detector 46 are provided. It is.

  The quick freezing switch 45 is provided, for example, on the outer surface of the quick freezing compartment door 6 and, when turned on by the user of the cooling device, gives a signal instructing the start of the precooling mode to the control unit 44. The temperature detector 46 detects the temperature of the atmosphere in which the cooling device is installed, and gives a signal indicating the detection result to the control unit 44. The control unit 44 controls the Stirling refrigerator 11, the cooling fan 24, and the quick freezing fan 23 in accordance with signals from the temperature detectors 40, 41, 46 and the quick freezing switch 45.

  10 and 11 are flowcharts showing the control operation of the control unit 44. In this cooling device, the object to be frozen is accommodated in the quick freezing chamber 3 before and after the quick freezing switch 45 is turned on. In step S41, the control unit 44 waits for the quick freezing switch 45 to be turned on. When the quick freezing switch 45 is turned on, the pre-cooling mode is started in step S42. When the pre-cooling mode is started, in step S43, the control unit 44 sets the cooling capacity of the Stirling refrigerator 11 to a higher level than usual, turns off the cooling fan 23, starts the pre-cooling timer, and starts the temperature detector 46. The pre-cooling predetermined time is set based on the installation atmosphere temperature detected by. For example, when the installation atmosphere temperature is higher than the standard temperature (for example, 20 ° C.), the control unit 44 corrects the precooling predetermined time to be longer, and when the installation atmosphere temperature is lower than the standard temperature, the control unit 44 corrects the precooling predetermined time to be shorter.

  In step S44, temperature control in the precooling mode is performed. FIG. 11 is a flowchart showing temperature control in the precooling mode. In step S51, the control unit 44 determines whether or not the temperature Tc of the low temperature side evaporator 15 detected by the temperature detector 40 is equal to or lower than a set value. If Tc is equal to or lower than the set value, the process proceeds to step S45. If is not less than the set value, the process proceeds to step S52. As the set value of Tc is set to a lower temperature, the cold storage effect of the secondary refrigerant increases, and the time for the object to be frozen to pass through the maximum ice crystal generation temperature zone can be shortened. However, if the set value of Tc is set too low, the secondary refrigerant may freeze. Therefore, the set value of Tc needs to be set to a temperature at which the secondary refrigerant does not freeze.

  In step S52, it is determined whether or not the time elapsed since the start of precooling is equal to or longer than the predetermined time for precooling. If the predetermined time is equal to or longer than the predetermined time for precooling, the process proceeds to step S45. Here, the pre-cooling predetermined time is set to a time for cooling the standard amount and standard temperature of the object to be frozen to the maximum ice crystal generation temperature zone upper limit temperature in the quick freezer 3 at the normal operation temperature.

  In step S45, the cooling fan 24 and the quick freezing fan 23 are turned on, and the quick freezing mode is executed in step S46. The temperature control in the quick freezing mode is as described in FIG. In step S47, the control unit 44 determines whether or not a predetermined time has elapsed since the quick freezing switch 45 was turned on. If the predetermined time has not elapsed, the control unit 44 returns to step S46, and if the predetermined time has elapsed, Return to normal temperature control mode.

  In the second embodiment, the cooling capacity of the Stirling refrigerator 11 is increased in response to the quick refrigeration switch 45 being turned on, and the cooling fan 24 is turned off to lower the temperature of the secondary refrigerant circulation circuit to store the cold. After a predetermined time has elapsed, the cooling fan 24 and the quick freezing fan 23 are turned on. Therefore, the object to be frozen that has been pre-cooled to near the maximum temperature of the maximum ice crystal generation temperature zone can be rapidly passed through the maximum ice crystal generation temperature zone by the cooling power stored in the secondary refrigerant circulation circuit, and can be frozen by freezing and thawing. It is possible to prevent quality degradation of the object. Moreover, since the cooling capacity of the Stirling refrigerator 11 is increased only when the quick freezing switch 45 is turned on, an increase in power consumption can be suppressed.

  In the second embodiment, the precooling mode is started in response to the quick freezing switch 45 being turned on. However, in response to the quick freezing switch 45 being removed and the quick freezing compartment door 6 being opened. The pre-cooling mode may be started.

  FIG. 12 is a block diagram showing a modification of the second embodiment, and is a diagram contrasted with FIG. Referring to FIG. 12, this cooling device is different from the cooling device of FIG. 9 in that temperature detector 46 is removed. In the cooling device of FIG. 9, the installation atmosphere temperature of the cooling device was detected by the temperature detector 46 in step S43, and a precooling predetermined time was set based on the detection result. However, when the temperature Tq of the quick freezer 3 can be switched in a plurality of stages, it is necessary to change the precooling predetermined time according to the temperature Tq of the quick freezer 3. Therefore, in the cooling device of FIG. 12, the precooling predetermined time is set in step S43 based on the temperature Tq of the quick freezer 3 detected by the temperature detector 41 at the start of the precooling mode. For example, when the temperature Tq of the quick freezer 3 is higher than the standard temperature (for example, −18 ° C.), the control unit 44 corrects the precooling predetermined time longer, and when the temperature Tq of the quick freezer 3 is lower than the standard temperature. Corrects the pre-cooling predetermined time short. In this modified example, the precooling predetermined time can be appropriately set according to the temperature Tq of the quick freezer 3. Needless to say, it is more preferable to set the precooling predetermined time based on both the temperature Tq of the quick freezer 3 and the installation atmosphere temperature of the cooling device.

  Further, instead of setting a predetermined precooling time, the temperature at which the secondary refrigerant is related to a predetermined temperature so that the secondary refrigerant does not freeze (temperature of the low-temperature side condenser 12, temperature of the low-temperature side secondary refrigerant circulation pipe, low temperature) When the temperature of the side evaporator 15) reaches, it may be switched to the quick freezing mode operation.

  FIG. 13 is a block diagram showing another modification of the second embodiment, and is a diagram contrasted with FIG. Referring to FIG. 13, this cooling device is different from the cooling device of FIG. 9 in that temperature detector 46 is replaced with a temperature detector 47. The temperature detector 47 detects the temperature of the object to be frozen 48 accommodated in the quick freezer compartment 3. In the cooling device of FIG. 13, the pre-cooling predetermined time is not set in step S43, and it is determined in step S52 whether or not the temperature of the object to be frozen 48 has reached the maximum ice crystal generation temperature zone upper limit. If the zone upper limit has not been reached, the process returns to step S51, and if the zone has reached the maximum ice crystal generation temperature zone upper limit, the process proceeds to step S45. In this modified example, the precooling mode can be switched to the quick freezing mode depending on the temperature of the object 48 to be frozen.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing which shows the structure of the cooling device by Embodiment 1 of this invention. It is a figure which shows the piping structure of the cooling device shown in FIG. It is a block diagram which shows the part relevant to quick freezing in the cooling device shown in FIG. It is a part of flowchart which shows the quick freezing method in the cooling device shown in FIG. It is the remaining part of the flowchart shown in FIG. It is a flowchart which shows the temperature control of the precooling mode shown in FIG. It is a flowchart which shows the quick freezing cancellation | release mode shown in FIG. It is a flowchart which shows the temperature control of the quick freezing mode shown in FIG. It is a block diagram which shows the part relevant to the quick freezing of the cooling device by Embodiment 2 of this invention. It is a flowchart which shows the quick freezing method in the cooling device shown in FIG. It is a flowchart which shows the temperature control of the precooling mode shown in FIG. FIG. 10 is a block diagram showing a modification example of the second embodiment. FIG. 10 is a block diagram showing another modification example of the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Housing, 2 refrigerator compartment, 3 quick freezer compartment, 4 freezer compartment, 5 refrigerator compartment door, 6 quick freeze compartment door, 7 freezer compartment door, 8 door packing, 9 shelf, 10 machine room, 11 Stirling refrigerator, 12 low temperature Side condenser, 14 Low temperature side secondary refrigerant circulation pipe, 15 Low temperature side evaporator, 16 Low temperature side evaporator chamber, 20 Duct, 21 Cold air outlet, 22 Refrigeration fan, 23 Quick refrigeration fan, 24 Cooling fan, 30 High temperature side Secondary refrigerant circulation pipe, 31 High temperature side condenser, 32 Blower fan, 40, 41, 46, 47 Temperature detector, 42 Pre-cooling switch, 43 Door open / closed state detector, 44 Control unit, 45 Quick freeze switch, 48 Freezing target Stuff.

Claims (10)

A cooling device with a freezer compartment,
Evaporator, cooled by refrigerator
A cooling fan for supplying cool air from the evaporator into the freezer compartment, and a control unit for executing a pre-cooling mode operation for stopping the cooling fan and driving the refrigerator based on input of a signal related to quick freezing Cooling equipment. A cooling device having a freezing room cooled by a freezer,
A low-temperature evaporator that receives cold from the cooling unit of the refrigerator via a secondary refrigerant;
A cooling fan that supplies cold air from the low-temperature side evaporator into the freezer compartment, and a control unit that executes a precooling mode operation that stops the cooling fan and drives the refrigerator based on input of a signal related to quick freezing With cooling equipment. A door state detector for detecting an open / closed state of the freezer door;
Based on the detection result of the door state detector, the control unit switches from the precooling mode operation to the quick freezing mode operation in response to the opening of the freezer compartment being closed and cooling the refrigerator. The cooling device according to claim 1 or 2, wherein the cooling fan is driven while setting the capacity to a level higher than that of normal operation. A temperature detector for detecting a temperature related to the secondary refrigerant;
The cooling device according to claim 2 or 3, wherein the control unit controls the cooling capacity of the refrigerator so that the secondary refrigerant does not freeze based on a detection result of the temperature detector. A quick freezing switch for inputting a signal related to the quick freezing,
The control unit sets the cooling capacity of the refrigerator to a level higher than that of normal operation and drives the cooling fan after executing the precooling mode operation for a predetermined time based on an input of a signal related to the quick freezing. The cooling device according to claim 1 or 2, wherein the quick freezing mode operation is executed.   6. The cooling apparatus according to claim 5, wherein the predetermined time is a time for cooling a standard amount and a standard temperature object to be frozen to a maximum ice crystal generation temperature zone upper limit temperature in a freezer room at a normal operation temperature. A temperature detector for detecting an installation atmosphere temperature of the cooling device;
The cooling device according to claim 6, wherein the predetermined time is determined based on a detection result of the temperature detector. A temperature detector for detecting the temperature of the freezer;
The cooling device according to claim 6, wherein the predetermined time is determined based on a detection result of the temperature detector at the start of the pre-cooling mode operation. A quick freezing switch for inputting a signal related to the quick freezing, and a temperature detector for detecting a temperature related to the secondary refrigerant,
The control unit performs the pre-cooling mode operation based on an input of a signal related to the quick freezing, and based on a detection result of the temperature detector, the control unit is set to a predetermined temperature so that the secondary refrigerant does not freeze. The cooling device according to claim 2, wherein after the temperature related to the secondary refrigerant reaches, the cooling capacity of the refrigerator is set to a level higher than that of a normal operation and the quick freezing mode operation for driving the cooling fan is executed. . It has a temperature detector that detects the temperature of the frozen object,
The control unit executes the pre-cooling mode operation based on an input of a signal related to the quick freezing, and based on a detection result of the temperature detector, the temperature of the object to be frozen reaches a maximum ice crystal generation temperature zone upper limit. 3. The cooling device according to claim 1, wherein the cooling capacity of the refrigerator is set to a level higher than that of a normal operation and a quick freezing mode operation for driving the cooling fan is executed.

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